Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 79: Gammaastronomie III
T 79.7: Talk
Thursday, March 22, 2018, 18:05–18:20, Philo-HS7
Spectral and Temporal Behaviour of Mrk 501 in Gamma Rays — •Daniela Dorner1, Michael Blank1 for the FACT collaboration, Nachiketa Chakraborty2, and Carlo Romoli3 for the H.E.S.S. collaboration — 1Universität Würzburg, Germany — 2MPIK Heidelberg, Germany — 3DIAS, Dublin, Ireland
The blazar Mrk 501 is a well-known BL-Lac type object emitting some of the highest energy photons emanating from an extragalactic source. It is highly variable down to timescales of a few minutes at TeV energies. This makes it an excellent laboratory for studying particle acceleration and radiative emission processes in jets through the spectral and temporal properties of the observed emission.
Since 2012, the First G-APD Cherenkov Telescope (FACT) is continuously monitoring Mrk 501 providing a total of more than 2000 hours of physics data. In June 2014, FACT recorded enhanced activity with an exceptional outburst at TeV energies on June 23rd. Several alerts were sent to the community. Based on this, also H.E.S.S. has observed the high state of Mrk 501 comparable to its historical maximum of 1997. At GeV energies, the Fermi satellite is monitoring the sky.
Here, we present the complex temporal and spectral behaviour of Mrk 501 in gamma-ray energies. We compute the gamma-ray power spectral density as well as the energy spectrum for the highest TeV flux state observed by H.E.S.S. and FACT in June 2014. We compare the behaviour of the strong activity in June with the long-term behaviour in the whole 2014 season. Furthermore, we study the spectral index in correlation with the different fluxes states.